/*
 * Copyright 2017 ~ 2025 the original author or authors. James Wong <jameswong1376@gmail.com>>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.wl4g.infra.common.codec;

import static com.google.common.base.Charsets.UTF_8;
import static com.wl4g.infra.common.lang.Assert2.hasTextOf;
import static com.wl4g.infra.common.lang.Assert2.notNullOf;
import static java.util.Objects.isNull;
import static java.util.Objects.nonNull;

import java.io.Serializable;
import java.util.Arrays;

import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;

/**
 * Codec cryptical hash IO data source.
 * 
 * @author James Wong <jameswong1376@gmail.com>>
 * @version v1.0 2020年4月8日
 * @since
 */
public class CodecSource implements Serializable {
    private static final long serialVersionUID = 9127527471762896518L;

    /**
     * Origin data bytes.
     */
    @NotNull
    final byte[] bytes;

    /**
     * Transient cache hex string.
     */
    private transient String cachedHex;

    /**
     * Transient cache base64 string.
     */
    private transient String cachedBase64;

    /**
     * Transient cache base58 string.
     */
    private transient String cachedBase58;

    public CodecSource(@NotNull final byte[] plainArray) {
        notNullOf(plainArray, "plainArray");
        this.bytes = plainArray;
    }

    /**
     * Creates an instance by converting the characters to a byte array (assumes
     * UTF-8 encoding).
     *
     * @param plainChars
     *            the source characters to use to create the underlying byte
     *            array.
     * @since 1.1
     */
    public CodecSource(@NotNull final char[] plainChars) {
        notNullOf(plainChars, "plainChars");
        this.bytes = new String(plainChars).getBytes(UTF_8);
    }

    /**
     * Creates an instance by converting the String to a byte array (assumes
     * UTF-8 encoding).
     *
     * @param plaintext
     *            the source string to convert to a byte array (assumes UTF-8
     *            encoding).
     * @since 1.1
     */
    public CodecSource(@NotBlank final String plaintext) {
        hasTextOf(plaintext, "plaintext");
        this.bytes = plaintext.getBytes(UTF_8);
    }

    public final byte[] getBytes() {
        return bytes;
    }

    public final boolean isEmpty() {
        return isNull(bytes) || bytes.length == 0;
    }

    public final synchronized String toHex() {
        if (isNull(cachedHex)) {
            cachedHex = Hex.encodeHexString(getBytes());
        }
        return cachedHex;
    }

    public final synchronized String toBase64() {
        if (isNull(cachedBase64)) {
            cachedBase64 = Base64.encodeBase64String(getBytes());
        }
        return cachedBase64;
    }

    public final synchronized String toBase58() {
        if (isNull(cachedBase58)) {
            cachedBase58 = Base58.encodeBase58(getBytes());
        }
        return cachedBase58;
    }

    public boolean equals(final CodecSource o) {
        if (nonNull(o) && o == this) {
            return true;
        }
        return Arrays.equals(getBytes(), o.getBytes());
    }

    public int hashCode() {
        if (isNull(bytes) || bytes.length == 0) {
            return 0;
        }
        return Arrays.hashCode(bytes);
    }

    public String toString() {
        return new String(getBytes(), UTF_8);
    }

    /**
     * Create {@link CodecSource} with hex chars.
     * 
     * @param hexString
     * @return
     */
    public static CodecSource fromHex(final String hexString) {
        try {
            return new CodecSource(Hex.decodeHex(hexString.toCharArray()));
        } catch (DecoderException e) {
            throw new IllegalStateException(e);
        }
    }

    /**
     * Create {@link CodecSource} with hex bytes.
     * 
     * @return
     */
    public static CodecSource fromHex(final byte[] hexArray) {
        try {
            return new CodecSource(Hex.decodeHex(new String(hexArray, UTF_8).toCharArray()));
        } catch (DecoderException e) {
            throw new IllegalStateException(e);
        }
    }

    /**
     * Create {@link CodecSource} with base64 string.
     * 
     * @param base64
     * @return
     */
    public static CodecSource fromBase64(final String base64) {
        return new CodecSource(Base64.decodeBase64(base64));
    }

    /**
     * Create {@link CodecSource} with base64 byte array.
     * 
     * @param base64Array
     * @return
     */
    public static CodecSource fromBase64(final byte[] base64Array) {
        return new CodecSource(Base64.decodeBase64(base64Array));
    }

    /**
     * Create {@link CodecSource} with base58 string.
     * 
     * @param base58
     * @return
     */
    public static CodecSource fromBase58(final String base58) {
        return new CodecSource(Base58.decodeBase58(base58));
    }

    /**
     * Create {@link CodecSource} with base58 byte array.
     * 
     * @param base58Array
     * @return
     */
    public static CodecSource fromBase58(final byte[] base58Array) {
        return new CodecSource(Base58.decodeBase58(new String(base58Array, UTF_8)));
    }

}